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Old 09-04-2017, 05:21 AM   #4 (permalink)
2000mc
herp derp Apprentice
 
Join Date: Oct 2008
Location: Lawrence, KS
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Saturn-sold - '99 saturn sc1
Team Saturn
90 day: 28.28 mpg (US)

Yukon - '03 GMC Yukon Denali
90 day: 14.4 mpg (US)
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Aerodynamic Investigation of Vehicle Cooling-Drag ...It is estimated that about 10% of the overall aerodynamic drag originates from the cooling...

https://www.slideshare.net/mobile/fr...g-aerodynamics ...cooling and ventilation system ~ 10%...

3% or 1/3 of the 10% seems reasonable for a DIY modification to a still functioning cooling system
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